12917509 has 4 divisors (see below), whose sum is σ = 14091840. Its totient is φ = 11743180.

The previous prime is 12917507. The next prime is 12917563. The reversal of 12917509 is 90571921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90571921 = 11 ⋅8233811.

It is a cyclic number.

It is not a de Polignac number, because 12917509 - 2¹ = 12917507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12917503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587149 + ... + 587170.

It is an arithmetic number, because the mean of its divisors is an integer number (3522960).

Almost surely, 2^12917509 is an apocalyptic number.

It is an amenable number.

12917509 is a deficient number, since it is larger than the sum of its proper divisors (1174331).

12917509 is a wasteful number, since it uses less digits than its factorization.

12917509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174330.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 12917509 is about 3594.0936270498. The cubic root of 12917509 is about 234.6350696291.

The spelling of 12917509 in words is "twelve million, nine hundred seventeen thousand, five hundred nine".